Consolidated Statements of Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues
Revenue	$ 428,503	$ 460,227	$ 1,257,728	$ 1,335,693
Operating expenses
Salaries, wages, and benefits	134,887	128,117	389,971	400,742
Fuel and fuel taxes	47,460	57,423	141,738	173,516
Vehicle rents	19,470	19,497	57,025	58,912
Depreciation and amortization, net of (gain) loss on sale of property	26,684	24,541	74,498	73,396
Operating expenses and supplies	29,525	30,538	87,438	89,402
Insurance premiums and claims	19,570	25,128	63,189	64,463
Operating taxes and licenses	3,533	3,522	10,112	10,432
Communications and utilities	2,209	2,258	6,659	7,149
General and other operating expenses	19,450	16,579	54,044	49,728
Gain on sale of subsidiary			(670)
Total operating expenses	425,221	437,335	1,233,021	1,277,929
Operating income	3,282	22,892	24,707	57,764
Other expense (income)
Interest expense, net	5,467	4,815	16,366	29,771
Early extinguishment of debt				7,753
Equity in loss of affiliated companies	91	73	270	250
Other, net		(133)	26	34
Nonoperating Income (Expense), Total	(5,558)	(4,755)	(16,662)	(37,808)
Income before income tax provision	(2,276)	18,137	8,045	19,956
Income tax provision	(813)	1,679	1,503	1,081
Net total and comprehensive income (loss)	(1,463)	16,458	6,542	18,875
Net total and comprehensive income (loss) attributable to noncontrolling interest	(17)	329	595	972
Net total and comprehensive income(loss) attributable to controlling interest	$ (1,446)	$ 16,129	$ 5,947	$ 17,903
Earnings (loss) per share
Basic earnings (loss) per share (in dollars per share)	$ (0.03)	$ 0.33	$ 0.12	$ 0.77
Basic weighted average shares outstanding (in shares)	48,984	48,296	48,709	23,118
Diluted earnings (loss) per share (in dollars per share)	$ (0.03)	$ 0.33	$ 0.12	$ 0.76
Diluted weighted average shares outstanding (in shares)	48,984	49,597	49,289	23,638
Cargo and Freight [Member]
Revenues
Revenue	$ 386,666	$ 413,887	$ 1,133,162	$ 1,199,553
Fuel Surcharge [Member]
Revenues
Revenue	41,837	46,340	124,566	136,140
Shipping and Handling [Member]
Operating expenses
Purchased transportation	$ 122,433	$ 129,732	$ 349,017	$ 350,189